If you fall below target, volume gradually decreases to zero.
Volume is restored when you reacquire target
Product description
Unique heart rate monitor motivates heart rate target zone training with music. If your heart rate falls below target zone, music volume gets lower! You must increase your heart rate to restore volume. Requires a bluetooth heart monitor such as the "Zephyr HXM" available online. Download free to see the onboard demo.
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